90878643 has 6 divisors (see below), whose sum is σ = 131269164. Its totient is φ = 60585756.

The previous prime is 90878633. The next prime is 90878657. The reversal of 90878643 is 34687809.

It is a happy number.

It is not a de Polignac number, because 90878643 - 2⁹ = 90878131 is a prime.

It is not an unprimeable number, because it can be changed into a prime (90878633) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5048805 + ... + 5048822.

It is an arithmetic number, because the mean of its divisors is an integer number (21878194).

Almost surely, 2^90878643 is an apocalyptic number.

90878643 is a deficient number, since it is larger than the sum of its proper divisors (40390521).

90878643 is a wasteful number, since it uses less digits than its factorization.

90878643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10097633 (or 10097630 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The square root of 90878643 is about 9533.0290569158. The cubic root of 90878643 is about 449.5941080769.

The spelling of 90878643 in words is "ninety million, eight hundred seventy-eight thousand, six hundred forty-three".